Work-holder for lens-drilling machines.



G. A. BADER & C. W. HOWLAND.

WORK HOLDER FOR LENS DRILLING MACHINES. APPLICATION ms!) MAR. 28. I913.

1 ,162,327, Patented Nov. 30, 1915.

4 SHEETS-SHEET I.

WITNE S: [NVENTORJ' AVTTORNE Y.

G. A. BADEB & C. W. HOWLAND.

WORK HOLDER FOR LENS DRILLING MACHINES.

APPLICATION FILED MAR. 28. 19I3.

1,162,327, Patented Nov. 30, 1915.

4 SHEETSSHEET 2.

I/ I 4 125" I- I 1 I2/ 719 5 20 fly. i 20 2/ 44 I $5 I Q 67 7/; 60 M3 35 1 fi \Qyl 5 373 5/ hi I I 35' Z rg5 g 37 3 WITNESSES [NVENTORJ ATTORNEY.

COLUMBIA PLANM A FR FOUWASHINGTPIN. n. c.

G. A. BADER & C. W. HOWLAND.

WORK HOLDER FOR LENS DRILLING MACHINES.

APPLICATION FILED MAR. 28. I913.

1,162,327. Patented Nov. 30, 1915.

4 SHEETS-SHEET 3.

IVITJVE S: [NVENT R5 ATTORNEY.

G. A. BADER & C. W. HOWLAND.

WORK HOLDER FOR LENS DRILLING MACHINES.

APPLICATION FILED MAR. 2B. 1913.

1,162,327. Patented Nov. 30, 1915.

4 SHEETS-SHEET 4.

11ml Will!!! If I EN I I TT0HNYJ GUSTAV A. BADER, OF ROCHESTER, AND

YORK, ASSIGNORS TO THE STANDARD A CORPORATION OF YORK.

rairnnir errien.

WORK-HOLDER FOR LENS-DRILLING MACHINES.

icence.

Specification of Letters Eatent.

Eatented Nov. 30, 1915.

Application filed March 28, 1913. Serial No. 757,326.

To all to hom it may concern:

Be it known that we, GUSTAV A. BADER and CHAUNGEY W. HOWLAND, respectively of Rochester, in the county of Monroe and State of New York, county of Ontario, have invented new and useful Improvements in lVork-Holders for Lens-Drilling Machines, of which the following; taken inconnection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improve- 7 ments in lens drilling machines of the'class set forth in our pending applications No. 719,950 filed September 12, 1912 and No. 750%28 filed February 2d, 1913, in so far as it relates broadly to a lens support which. is adjustable horizontally and vertically to difi'erent angles relatively to the axis of a rotary and axially movable drill" spindle.

In drilling lenses for the reception of mountings and for other purposes, tomary to drill partway through the lens from one side and then to reverse the lens and drill from the opposite side until the drill point reaches the apex ofthe previ ously drilled hole, thus forming an aperture which is shaped somewhat likeanhour-glass or contracted at the meeting ends of the two drill holes after 'whichthe contracted portion is reamed and finished to the desired size by means of a reamer and frequently results in breaking away the adjacent portions of the lens between the hole and rim.

The main object, therefore, of our present invention is to provide a lens drilling machine by which the holes for the mountings may be easily and quickly drilled from oppo site sides of the lens with perfect accuracy to finish the hole with the drill without the additional operation of reaming and without liability of breaking either the lens or drill even in the hands of unskilled or careless operators.

Another object is to enable the lens holder with the lens thereon to be adjusted horizontally so as to bring the mechanical axis of thelens to the same angle at either side of its neutral position by a single gage setting of the lens holder so that when the lens support is set to drill a lens part-way through from one side a predetermined dis-- tance off-center, such lens may be reversed in the holder and the latter adjusted angularly and of Geneva, in the in the State of New York,

it is cusi in the opposite direction until automatically stopped and then redrilled from the opposite side with the assurance that the two drill holes from opposite sides will be in exact alinement. I I

Another object is to obviate as far as possible the use of screws and similar fastening means in assembling the various parts of the lens support and its cooperating adjuncts.

Other objects and uses relating tospecific parts of the machine will be brought out in the following description.

In the drawings :Figure 1 is a side elevation of a lens drilling machine embodying the various features of our invention. Fig. 2 is ahorizontal sectional view taken on line 2-2, Fig. 1. Fig. 3 is vertical sectional view of the lens support taken on line 3-3, Fig. 1. Figs. 4c and 5 are horizontal sectional views of portions of the mechanism shown in Fig. 8. Fig. 6 is atcpplan'of a horizontally adjustable portion of the lens support in position for drilling the lens off-center from one side, the dotted lines indicating the position of adjustment for completing the drill hole from the opposite side. Figs. 7 and 8 :are perspective views of the detached lens clamping plates, a portion of Fig. 7 belng broken away to show the vertical slots in the end thereof. Fig. 9 is a perspective view of the detached lens centering and decentering block. Fig.10 is a perspective view of the detached base block for receiving and supporting the block shown in Fig. 9. Fig. 11

of thedetached gage the centering and de-' Fig. 12 1s a perspecis' a perspective view plate 'for regulating centerlng of the lens.

tive view of the detached locking plate for the lens centering and decentering block,

shown in Fig. 9. Fig. 13 is a transverse vertical sectional view through a portion of the workholder showing more particularly the lens rest and drill as operating upon a lens. Fig. 14 is a face view of the adjusting'means for the edge-limiting stop and adjacent-portions of the drilling machine. Fig. 15 is a vertical sectional view through the connections between the rock arm and main operating lever for raising and lowering the drill, showing more particularly the connection between said rock arm and vertical guide rod by which the drill spindle is raised and lowered.

This drilling machine comprises an up- -6- carrying The forward ends of the arms 3 and are provided with vertically alined journal bearings -10 for receiving a vertically disposed revoluble drill spindle 1 having its lower end provided with a drill l3, the upper end of said drill spindle being journaled in a yoke 15 which is disposed some distance above the upper arm or bracket 4- and is secured to the upper end of a vertical guide rod 16-. This guide rod is slidable endwise in vertically alined ways 17- and extends a short distance below the lower arm 3 and together with the yoke 15- constitutes what may be termed the supporting frame for the drill spindle for moving the latter axially.

A pulley -18is secured to the intermediate portion of the drill spindle 11- between the arms or brackets 3- and -4- and is adapted to be driven by the means comprises a bracket -20 rearwardly pro ecting splndle 21 our-- belt previously mentioned which passes around the sheaves 8- and is adapted to be connected to any available source of power, not necessary to herein illustrate or describe.

TVor]: hoZrZer.-Suitable means is provided for supporting the lensin a horizontal plane or at right anglesto the axis of the drill spindle and also for supporting It at angle above or below such hori zontal position or at different angles reladrill spindle ac-- tively to the axis of the cordlng to the contour of the lens; (that is, whether'plain or toric) in the major axis or This lens holding having a so as to drill the same at either side thereof.

naled in a suitable bearing -22 in the intermediate portion of the standard l so as to enable the bracket to be adjusted rotarily or tiltedyertically to different angles. The front end of the spindle 21 at its junction with larged to form an annular shoulder 23 abutting against the adjacent face of the standard and is preferably graduated to indieate the degree of angular adjustment, the rear end of the spindle being provided with a removable shoulder or washer 24: and

and also for adjust-- ing the lens horizontally to different angles the bracket -22 is -en-' clamping screw 25- which together with the shoulder 23 hold the spindle and bracket in operative positions against axial movement. The journal bearing for the bracket 20 is located a sufficient distance to the rear of the drill spindle to afford ample clearance for the manipulation of the lens as ain the lens clamp hereinafter described, the axis of movement of the bracket 20 being disposed in the same vertical plane from front to rear as that of the drill. spindle and also in approximately the same horizontal plane as the lens rest presently described, said bracket being held in its adjusted position by a set screw 25-. The object of this vertical angular adjustment of the supporting bracket 20-- of the lens holder is to enable the portion of the lens which is to be drilled to be brought into a horizontal plane at right angles to the axis of the drill spindle either in the major axis or at either side thereof. The bracket 20- extends downwardly from its supporting spindle 'Z1 and is provided with a forwardly projecting horizontal offset 26 underlying the drill spindle transversely of the axis thereof for receiving and supporting a base block -27 forming a part of the lens holder and screwed to the upper face of the offset -26 of the bracket 20 by suitable fastening means as screws 28.

The base block 27 and its supporting arm 26 extend laterally a greater distance to one side (preferably the left-hand side) of the axis of the drill spindle than to the other side so as to afford ample support for the adjustable lens clamps in drilling the lens close to the right hand edge thereof, said block being provided with a raised portion -29 having lengthwise ribs 30 and 31- near the edges thereof butspaced some distance apart to form an intervening relatively shallow recess 3Q for'receiving and guiding a horizontally adjustable drill centering and de-centering gage plate 33 shown more clearly in Fig. 4, the intermediate portion of the rib 31 being cut away to form a recess -34- in which the operating arm as 35 and de-centering plate is movable.

The front side of the raised portion 29 of the base plate 27 is provided with a laterally projecting lengthwise rib 36 having graduations 37 coacting with an index on the operating arm 35 of the gage plate 33 to indicate the point at which the lens is to be drilled relatively to the major axis of such lens. For this purof the centering l so as to hold the centering the base block 27- (in this instance left-hand side) of the axis of the drill spindle, Fig. 3. V 1

The base block 27 and laterally swinging block i0 are preferably made of die castings and adapted to be detachably connected without the use of screws, rivets or bolts, and for this purpose the right-hand end of the raised portion 29 is provided as shown more clearly in r with a central semicircular ournal bearing 41 some distance to the left-hand side of the axis of the drill spindle and having its lower end enlarged or undercut for interlocking engagement with a journal stud "t2- projecting downwardly from the underside of the centering block 40, the lower end of the stud 42 having an enlarged semi-circular flange fitting in the enlarged portion of the journal bearing i block 4r0 on against upward displacement when in operative position.

The opposite or left-hand end of'the base block 27 is provided with a horizontally extending transverse groove ft3 concentric with the axis of the journal bearing -4:1- for receiving a toothed rack -44- on the adjacent end of the centering block l0, said rack being also concentric with,

the axis of the journal bearing -41.

The lefthand end of theraised portion 29- of the base block 27- and corresponding end of the centering block -4CO- are also concentric with the axis of the journal bearing 4-1, said end of the centering block -40 being extended under and downwardly across the corresponding end of the raised portion -29* and preferably extends from side to side thereof.

The groove -4:3 in which the rack ''4i4' is movable is open at both ends so as to allow the centering block --TO to be rocked laterally about the axis of the bear ing -4t1 so as to disengage the centering block from the base block 27 when, the gage plate 33- is moved to the left out of the path of the stop pin 39-.

The portions of the gage block 33 at opposite sides of the V-shaped slot 8 constitute stop faces converging from the inner end toward the opposite end of the plate, the point of convergence also forming a limiting stop fitting closely against the pin 39- for locking the centering block drill the lens onthe center or major axis and when the gage plate -33- is in this position, its index registers withthe zero graduation 37. These inclined stop faces are disposed at the same angle with and at opposite sides of a plane drawn through the axes of the bearing tl and drill spindle when the centering block is in its normal position for drilling stops of the gage plate,

in the major axis of the lens and having stepped bearings 33"-'.

By shifting the gage block to the left a predetermined distance indicated by the graduations 3'7 and withdrawing the locking bolt -i6-, the centering block -40 with the lens thereon may berocked laterally about its axis until limited by the stop pin -39 engaging one of the stepped thereby bringing the lens into position to drill part way through it such predetermined distance to one side of its center or major axis, and with the same setting of the gage inverted on the holder and the centering block -*l0- rocked in the opposite direction until again limited by the stop pin 39, thereby bringing the previously drilled part of the lens in exact alinement with the drill ready to finish the drilling of the hole through the lens. In like manner the gage plate 33 may be adjusted for drilling the lens at any predetermined distance indicated by the graduations -3'7- at either side of the center or major axis with the assurance that the drill holes from opposite sides of the lens will always 1 with a single setting of the gage plate.

A pair of lens clamping plates 50- and -51 are 'slidably mounted upon the upper face of the centering block 4:0- and are each provided withapair of roller studs -52- and 53 for properly centering the lens with its major axis in a medial line between the pins of each pair, the outward wise grooves 59 in opposite sides of the centering block -40-. The other lens clamping plate 51 is slidably mounted upon the upper face of the centering block 40 and is provided with opposite lonplate, the lens maybe be in exact alinement I head 5% and gitudinal flanges 60- extendin d wardly at the sides of the block 2t0- and arms 55 to the clamping plate 50,

said flanges 60 being provlded with inwardly projecting lengthwise ribs 61 underlying the opposite longitudinal arms -55 along which they are movable.

The lens clamping studs 53 are mounted directly upon the inner end of the plate 51, the opposite end of said plate extending downwardly across face of the head 34E of the clamping plate '50 and is provided with a pair of the outer end slots 62 spaced equi-distant apart from p the center -51- toward each of the plate for receiving suitable attaching members for a pair of springs (i3 shown more clearly in Fig. 5. These springs serve to connect the lens clamping plates -50 and -5l+- and are preferably arranged in lengthwise grooves inthe adj acent faces of the clamping member 50 and block 40, the inner ends of the springs being attached to pins 64- on the clamping plate 50, while the outer ends of the springs are attached 'to suitable rods 65 which enter the slots 62* and are provided with heads 66- outer end face of the lens clamping member 51 so that the springs normally tend to draw the clamping members -50 and other to hold their studs -52- and -53 in engagement with the perimeter of the lens asa Fig. 3. These studs are not only free to roll upon their I supporting pins to reduce friction but are preferably removable to permit them to be replaced by new ones when worn.

The springs -63- are located in registering lengthwise grooves in the inner faces of the arms 55- and adjacent faces of the block e0 equidistant from and at opposite sides of the longitudinal center of said block so as to move the lens clampingmembers in exact parallelism With said longitudinal center and therefore parallel with the major aXis of the lens to more accurately center the lens on the support, the outer ends of the springs -63 and attaching rod '65 being passed through registering apertures in the adjacent ends of the clamping plates -50 and 5l-. Th

ese clamping plates are drawn under yieldlng pressure toward an edge limiting stop -6( b means of a spring -68- to hold the edge of the lens aagainst said stop during the drilling operation.

he spring 68 is centrally disposed within registering openings in. the block f0 and outer ends of the clamping mem bers 50 and -5l and has its inner end attached to a suitable fastening member 69- and its outer end connected to an attaching member -70- similar to the attaching member -66- in that its outer end is provided with a head 7l engaged with the outer end face of the clamping member -53 The attaching member -70- is also seated in a slot -72- in the outer end of the clamping member 51- and opens from thebcttom thereof These open-sided slots for receiving the attaching members -66- and 71 permit the clamping plate 51 to be removed without disenthe springs -63- and -6S- from their respective fastening members -6 land -69.

The upper faces of the lens clamping members -50 and 51 adjacent the engaging the paratively light and under lVhen inserting a lens between the clamping pins and 53, the clamping plates 50 and 5l are drawn apart by hand against the action of the springs 63 a suflicient distance to allow the lens to enter between the pins and when the clamping members are released, said springs auto matically draw ward each other to cause the pins 52 and 53 to engage the perimeter of the lens and hold it in operative position upon the clamping plates.

he springs 6" and -68- are comlight tension just sufficient to draw the lens clamps toward each other with sufficient positiveness to center and hold the lens and to carry said lens intoengagement with the stop pin 67-, but it isdesirable to provide some means for temporarily holding the lens clamps some distance to the left of the drill spindle during the placing of the lens between the clamping pins, and for this purpose we have provided the rear side of the clamping member 5lwith a slot in which is pivotally mounted a holding pawl or detent 58 adapted to engage the adjacent end face of the'lenscentering and decentering block -l0. This detent is shown more clearly in Fig. 2 and consists of alever centrally pivoted to the adjacent side of the lens clamping plate 51- with opposite ends thereof disposed at an angle to each other so that when in its unlocked position, the locking end will project beyond the back face of the clamping plate 51 to be engaged by the fingers to press it to its looking position when the lens clamps are drawn back, and when in its locked position, the opposite end projects beyond the back face of the clamp -51- to be engaged by the fingers for unlocking, the lower end of the pawl being adapted to engage a shoulder -58 on the left-hand end of the block The standard -lis provided with a forwardly projecting integral arm -75 some distance below the lower arm 3-- for supporting the edge stop 67- and a plate -76 which is secured to the under side of the arm 75 and extends laterally across the axis of and under the drill 13 and is provided with an aperture in which is loosely mounted a lens rest -78. This lens rest preferably consists of a cylindrical pin or post co-aXial with the drill spindle and drill and provided with a conical upper end and an enlarged lower end orming a head Z9 having a rounding lower bearing face which is concentric with the produced axis of the supporting spindle the clamping members to 21 for the bracket 20 and is adapted to bear against the upper face of thelens centering block -4E0-.

The upper face of the block l0- thereforeforms a support for the lens rest 78-- to hold it in operative position in axial alinement with the drill spindle and at the same time permits the block -40- and its supporting bracket 20- to be tilted vertically to different angles without disturbing the position of the lens rest or post 78 which always remains in axial aline ment with the drill spindle, the object being to afford a firm bearing for the portion of the lens which is to be drilled during the drilling operation.

The upper lens bearing face of the lens rest 78- is disposed approximately at the intersection of the produced axes of the spindle -21- and drill spindle 11- but is a trifle below the horizontal plane of the spindle 21- so as to support the portion of the lens to be drilled in a horizontal plane or at right angles to the axis of the drill spindle, thereby permitting the lens to be drilled a part way through from opposite sides with the assurance that the opposite drill holes will be in exact alinement.

The stop pin -67 is disposed in the same vertical plane as the axis of the drill spindle but at right angles thereto and is adjustable toward and from said axis to gage the distance at which the lens is to be drilled from the edge thereof.

The stop pin 67- is preferably mounted in an externally threaded sleeve 67 which is screwed in a threaded opening -80 in the arm --75- and is provided with an operating member 81 by which the sleeve and pin may be adjusted toward and from the produced axis of the drill spindle, the periphery of the operating member -81- being graduated to register with a suitable index on an adjacent projection 82- of. the arm 75.

The inner end of the stop pin -67 is preferably flattened and arranged edgewise vertically and is held in this position by. means of an angular locking key 83 having one end inserted in the projection 82- and its other end passed through an aperture in the outer end of the stop pin as shown more clearly in Fig. 2.

The projection 82 preferably consists of a screw engaged with a threaded aperture in the arm -75 to afford means for slightly adjusting the stop pin when necessary to harmonize the readmg of the graduations on the operating member 8l with the corresponding distance of the stop pin from the produced axis of the drill spindle.

Suitable means is provided for moving the drill spindle and drill axially so as to drill the lens part way through under yielding pressure, and for this purpose we have provided a lever which is pivoted at its rear end at 91- to one side of the upper provided at its opposite or front end with a suitable handle 92 by which it may be depressed or raised if desired.

The drill spindle and its supporting portion of the standard1 and is frame including the guide rod 16 are held in their normal raisedpositions with the drill away from the lens rest 78 by means of a coil spring 93 encircling said guide rod 16- between the arm 3 and a suitable pin 94 on the rod -16. A rock arm 96 is fulcrumed on the same pivot 91 co-axial with the lever -90, in close'proximity thereto and is engaged with the pin '9 to reciprocate the drill spindie and its supporting frame as the lever -90 is operated in drilling a lens, said lever being 'movable separately from the rock arm 96. I

The lever 90 is yieldingly connected to the rock arm 96 through the medium of a spring 97- and bell crank lever -98-, the latter being pivoted at -9,9- to upstanding ears l00 on the rock arm and is provided with a rearwardly projecting apertured heel -101- for receiving an adjusting screw -l02- by which the lever 9,8 maybe adjusted to vary the tension of the spring -97. The object of these connections between the operating lever -90 and drill spindleis to enable the drill a to be brought into drilling engagement with the lens under a yielding and more unlform pressure and without liability of breaking tion of the spring -97, thereby applying the drill to the lens under a uniform pressure equal to the tension of the spring -97 and preventing excess pressure or feed of the drillwhich would tend to crack or break the lens. i

What we claim is:

1. A lens drilling machine having an axially movable drill spindle, a lens rest 00- axial with the drill spindle, and a lens'support tiltable to different angles about an axis substantially co-incident with the end of thelens rest nearest the drill at right angles to the axis of the drill spindle, the lower end of the lens resting on said support and being concentric with the axis of movement of said support.

2. A lens drilling machine having an axially movable drill spindle, a lens rest coaxial with the drill spindle, means for holding the lens rest against tilting movement a point in its relatively to its axis, and a lens clamp adjustable rotarily about an axis at substantially right angles to that of the drill spindle and lens rest.

3. A lens drilling machine having an axially movable drill spindle, lens rest consisting of a post co-axial with the spindle and having its end opposite that nearest the drill concentric with a point in its produced axis, and lens-holding means movable vertically about said point and having a portion thereof bearing against said concentric end of the post.

4. A lens drilling machine having an axiallymovable drill spindle, a lens rest consisting of a post coaxial with the spindle and having its end opposite that nearest the drill concentric with a workholders about produced axis, and lens holdlng means adjustable about an axis running through said point at right angles to that of the drill spindle and having a portion thereof bearing against the concentric portion of the lens rest.

5. A work-holder chines comprising a base block, a laterally swinging member having interlocking con nections with the base block, said connections being separable only when the laterally swinging member is moved to a certain position relatively to the base block, means including a locking bolt for locking the laterally swinging member in its adjusted position, and lens-clamping members slidable upon the laterally swinging member.

In a lens-drilling machine, in combination with a drill spindle, a lens holder adjustable rotarily about an axis at one side of that of the drill spindle, a stop pin on the holder, a gage plate having opposed stop faces in the path of said pin, and supporting means for the gage plate and lens holder.

7 A lens drilling machine having a drill spindle, a lens clamping device movable about an axis at one side of the produced axis of the drill spindle, a support for the clamping device and means for limiting such movement to different angles including a gage plate slidable on the support and having diverging bearing faces, and a stop pin on the clamping device between and adapted to be engaged by said faces.

8. A lens drilling machine having a drill spindle, an abutment for the edge of the for lens-drilling malens at one side of the produced axis of the spindle, a lens clamping device movable to and from said abutment and adjustable rotarily about an axis at the opposite side of the produced axis of the spindle, a support for the clamping device and means for limiting the angular adjustment of the lens clamping device comprising a stop pin on the clamping device, and a gage plate on the support having diverging bearing faces at opposite sides of the pin and adjustable toward and from said abutment.

9. A lens drilling machine having a drill spindle and alens clamping device comprising a pair of relatively movable clamping members, asupport for said members, a stop for engaging the edge of the lens, means for forcing both clamping members toward the stop, and separate means for forcing said members into their clamping positions for engaging the lens.

10. A worlcholder for lens-drilling machines comprising a supporting base, a laterally swinging member mounted thereon movable to opposite sides a stop pin on the laterally swinging member, a sliding member guided on the base block and provided with opposed stops coacting with opposite sides of the pin equi distant therefrom for limiting the movement of the laterally swinging member in reverse directions, and a lens-clamp mounted on the laterally swinging member.

11. A work-holder for lens-drilling machines comprising a supporting base, a laterally swinging member mounted on the base, means for holding a lens in the vertical plane of the axis of the laterally swinging member, a stop pin in said plane, and an adjustable plate movable parallel with said plane and having a V-shaped recess in one end forreceiving said pin, the apex of the recess being disposed in the plane of the pin and the sides of the recess diverging at equal angles therefrom.

In witness whereof we have hereunto set our hands this 20th day of March, 1913.

GUSTAV A. BADER.

CHAUNCEY W. HOVVLAND.

Witnesses:

. l/VILLIAM J. EsrEY, M. I. GOETCHINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

of a medial line, 

